Windshield cleaning system



Aug. 9, 1966 A' ,R D ^LB^ 3,264,669

v WINDSHIELD CLEANING SYSTEM Filed Sept, 28, 1964 2 Sheets-Sheet 1 Fig.2 5B INVENTOR. ANTHONY R. D 'ALBA BY-(CM T TORNEY A. R. D'ALBA Aug. 9,1966 WINDSHIELD CLEANING SYSTEM 2 Sheets-Sheet 2 Filed Sept. 28, 1964 iwp. W mE Y M /f .um N .An

w N2 5%@ @m ATTORNEY Unted States Patent O 3,264,669 WINDSHIELD CLEANINGSYSTEM Anthony R. DAlba, Williamsville, NX., assigner to Trico ProductsCorporation, Buffalo, N.Y.

Filed Sept. 28, 1964, Ser. No. 399,506 Claims. (Cl. 15-250.62)

The present invention relates to a windshield cleaning system and, moreparticularly, to a coordinated control system selectively operable toprovide continuous wiper operation with variable wiper frequency,intermittent dwell wiper operation with variable dwell periods,automatic switching from intermittent dwell to continuous wiperoperation during vehicle acceleration and conjoint washer-wiperoperation with a timed period of wiper operation to provide dry cyclingand means for manually aborting the timed period of wiper operation.

A versatile system is provided by this invention which incorporates manyadvantageous features to provide a completely coordinated windshieldcleaning system for optimum performance under all driving conditions.Although this system provides substantially complete automaticoperation, full operator control is provided for unusual or varyingdriving conditions. An important feature is the fully coordinatedwiper-Washer system whereby a single manual push-button operationinitiates discharge of solvent to the windshield and continuous wiperaction for a timed period to include a dry wipe cycle subsequent toprojection of the solvent onto the windshield. In the event that thesolvent freezes upon impingement on the windshield, the wiping actioncan be instantaneously aborted by manipulation of the same manualcontrol by which the action was initiated. This aborting featureprevents obscuring of the drivers vision caused by spreading of freezingsolvent across the windshield. The provision of rapid dry-wipe cycleaborting solves a long standing problem in the fully coordinatedwiper-washer art.

The principal object of the present invention is to provide an improvedwindshield cleaning system utilizing a unitized manual control assemblyfor- (1) Providing selective continuous frequency wiper operation;

(2) Intermittent dwell with manually selectable dwell period durations;

(3) A fully coordinated wiper-washer system with provision for abortingthe wiper cycling; and

(4) Automatic switching from intermittent to continuous operation duringacceleration periods.

Other objects and advantages of the invention will be apparent from thefollowing detailed description taken in connection with the accompanyingdrawings in which:

FIG. 1 is a fragmentary perspective view of an automotive vehicleshowing an embodiment of the instant invention;

FIG. 2 is a view in cross section of the unitary control switch of thepresent invention; and

FIG. 3 is a schematic diagram of the invention shown in FIG. l with thewasher button in operated position and certain elements thereof shownin-cross section.

Briefly, the invention comprises a wiper motor incorporating a couplerIactuated control valve, which control valve may be actuated eithermechanically or by fluid pressure. The control valve includes positionsfor continuous wiper operation at variable wiper cycle frequencies andintermittent dwell operation with variable dwell periods. A washer pump`is provided for transferring fluid from a reservoir to a Windshieldthrough a discharge nozzle. The washer pump may be of the type which isenergized by fluid pressure.

A manual control assembly is provided which includes a rotating knob anda spiral grooved element for convert- ICC ing rotary motion to linearmotion for driving a Bowden cable which actuates the Wiper control.Detent positions are provided for continuous wiper operation orintermittent dwell operation. When the manual control assembly isactuated to provide intermittent operation, it simultaneously opens thevalving which effects communication between a continuity valve and thewiper motor coupler. The continuity Valve is responsive to changes inthe manifold vacuum and upon dropping of the manifold vacuum duringvehicle acceleration, the continuity valve effects communication throughthe manual control valve from a vacuum storage tank to the wiper motorcoupler for shifting the wiper motor control from its intermittentposition to continuous operation. Timing means are provided in thecontinuity valve for maintaining continuous operation of the wiper motorfor a period following the initial acceleration.

The manual control assembly includes a manually operated push-buttonconcentric with the rotary control knob for effecting conjointwasher-wiper operation. Operation of the push-button admits storage tankvacuum through the manual control assembly and through a timer valve tothe washer and wiper for initiating action thereof. A timer valve isutilized which has provision for venting the washer and the Wipercoupler at different rates whereby solvent discharge and pump actionceases while the wiper motor remains in operation for a timed period.

In the event of solvent freezing on the windshield, wiper operation maybe aborted by manipulation of the rotary control knob on the unitizedmanual control assembly. The rotary control knob and stem are designedto be operated linearly, as well as by rotary motion, and a linear pullon the control knob effects venting of the wiper motor coupler directlythrough the unitized control assembly instantaneously, thereby causingthe coupler to move the wiper motor control to the of position, therebyaborting the timed wiper cycle. This prevents spreading of the freezingsolvent across the Viewing area of the operator of the motor vehicle.

In FIG. 1, an automotive vehicle 10 is shown having a windshield 12mounted therein in a conventional manner. Suitably mounted on the firewall of the vehicle is a hydraulic motor 14 coupled through atransmission linkage set 16 to drive pivot shaft 18 mounted on the cowlof the vehicle. Secured to the pivot shafts at one end thereof are wiperarms 20 having mounted on their other ends wiper blades 22 whichreciprocate across the windshield 12 in the usual manner whenthe wipermotor 14 is operating. There is shown mounted adjacent the motor shaft acam operated washer pump 24 which is operated by a cam 26 mounted on themotor shaft. Initial operation of the pump 24 is effected by Vacuumapplied through conduit 28 and pump operation is stopped by ventingthrough conduit 28. Although the pump 24 as illustrated is mountedadjacent the wiper motor shaft, it will of course be understood that acam actuated pump such as pump 24 may be mounted adjacent any movingpart of the wiper transmission system, -as for example, at one or theother of the pivot shafts 18, in which case a cam may be mounted on thepivot shaft for driving the pump.

The pump 24 includes an intake port 30 connected through a conduit, notshown, to a solvent reservoir, not shown, and a discharge port 32connected through a conduit 34, a T 35 and a conduit 37 to a pair ofdischarge nozzles 36 mounted on the cowl adjacent the windshield 12. Themanual control assembly 38 is mounted on the dash -of a vehicle 10 in aposition convenient to the driver. The manual control assembly 38 isconnected to the coupler 42 of a wiper motor 14 through conduit 40,timer valve 48 and conduit 46'. The coupler is also connected to themanual control assembly by a Bowden cable 44. The inlet of the timeriivalve 48 is connected to the manual `control assembly 38 through conduit49 and the outlet in the timing valve is connected to the wiper motorcoupler 42 through conduit 46 yand to the washer .pump through a conduit50; Aconduit 56-connects the continuity valve 54l to the manifold of avehicle. tinuity valve 54` to a vacuum storage tank 58.'.Y A'conduit 60connects the manual control kassembly to the vacuum storage tank 58 anda conduit 62 connects the continuity valve to the manual controlassembly 38.: The above describes the disposition and arrangement of theelements of the system on the vehicle.

The manual control assembly 38 includes a substan tially cylindricalhousing 64` including an enlarged -cylindrioal section 65 and acentrally disposed reduced diameter cylindrical portion 66 integraltherewith .adjacent one end. The section 65 has an interior spiral-land68.

Received in the housing 64 `is a `control assembly body 70 whichincludes an annular radially extending flange 72 disposed within theenlarged cylindrical.section65.- The radially extending `cylindricalflange 72 has a Vspiral groove 74'on its periphery whichreceives thespiral yland 68. Thus rotation of the control assembly body 70 withinthe housing 64 results in linear movementof-the control body 70. Thecontrol assembly body 70 is a substantially tubular member having areduced inner diameter section 76 and an enlarged inner diameter section77. The junction between inner diameter section 76 'i and an innerdiameter section 77 forms ya shoulder 78;`

constituting a valve seat. A valve 80 having `a stem82 is positioned toseat on valve seat 78 to control communciation between the innerdiameter sections 76 and 77 ofcontrolassembly body 70. Valve stem 821isslidably disposed within :the reduced inner` diameter section.

76. A shoulder 84 is formed within the body ,64 and constitutes a ,valveseat for receptionof an annular valve A conduit 52 connects the con- 86formed integrally with and extending radially of the i control assemblybody 70. The valve 86 includes an i annular resilient seal 88 whichseats on the valve seat 84 Vand closes a port 90 which controlscommunication between the conduit 62 from Ythe continuity valve 54' and.a chamber 89 of the control assembly housing 64.A

Chamber 89 is formed by the reduceddiameter portion 66 of controlassembly housing 64.l

The interior cross section of the valve body 70 adjacent one end 91 isyof polygonal cross section andreceives la drive sleeve 92 ofcomplementary polygonal cross section therein. The drive sleeve 92 is ofhollow= can be seen that rotation of the drive sleeve 92reffectsrotation of `the val-ve body 70, resulting inflongitudinalmovement of the valve body. Received in thehollow end of sleeve 92 is aspring 100 and a pushbutton 102 having an O-ring 104 forfsealing thesleeve .92 whiler permitting longitudinal movement of ,the push button102. The push button 102 is connected to thevalvestem 82 and islongitudinally` movable therewith. Thus-it can be seen that inwardpressure on the push button 102mm` seats valvehead '80, effectingcommunication between chambers 103 and 105 formed by inner diametersections 76 and 77, respectively. The spring 100 serves to return thepush b-utton 102 when it is released." It should be notedzthat knob 98maybe pulled longitudinally against the reaction of spring 100` toeffect unseating of valve 94. Radial openings 106 are sprovided,communicating between chamber 89 in the control housing section 66 andchamberr in kvalve body 70. Chamber 89 is in communication -Withach-amber 110in manual control housing 65 leading to, port 112whichconnects with conduit49. f The` inner end of -manualcontrolassembly body 70 includes la collet chuck 114 Vfor connection to theVBowdenvcable 44.i Thus `it can ybe seen thatrotationof the `manual`control yassembly body.V .70=\through rotation of knob "98 andconsequent longitudinal movement of they control body j70 results. inlongitudinalmovementof the Bowden cable. The :end vof ithe controlassembly 38 is sealed by a closure 116 :having a circumferential O-ring118 and a gland seal 120-through whi-ch the end of they control assemblybody-70 is slidable. Port 122, which communicates with Stor-age tank v58through conduit60 and port'112,r which communicates through conduit 49with the timer Valve 48, are formed in the closure 116.y

Thev continuity valve 54Ycornpri-ses a housing 126 having a cylinderportion 128;with Va piston 130 Vmovable f therein-.and a tubular portion132..Whereinthe piston rod 131 is slidable. Gland seals 134 and 136coacting with the piston rod 131 seal the tubular portion 132V .from

the cylinder portion 12.8; The endV of` Ythe piston rod v131 forms avalve whichseats on port 138to seal theconduit 52 leading to the vacuumstorage itank 58. The. piston ,is` spring Ibiased to-an `outwardpositionby spring 133,.un. i

seating the piston rod 131 and opening port v138. In response to highmanifold vacuum operating against the bias of spring 133, port 138 lisclosed. A port 140, com-y municates with the cylinder charnlber1128 andconnects Vthe cylinder chamber to the manifoldthroughconduit 56.'Vacuum-storage` tank 58 communicates `with coupler` 42Lof Wiper motory14 through conduit 52, port 138,ia port 142 in thetubular portion 132 ofthe continuity valve 54,` conduit 62,i`port 90,v chamber 89,!port 97,port 96 This, v occurs when valve-stem 131:.unseats from port138andconduit 40,'through tim-er ,48 land conduit 46.`

valve 90 is in the open position. l

The motor coupling and control valve is shown partly vin section in FIG3.= The coupling 42 .comprises a housing 144 having a piston assembly146,5slidable therein. The `piston assembly 146 in'cludesa hub portion148 havingy an. angular flange 150 integral `therewith which forms abacking .for a piston 152 of rubber or rubber-like material, mountedconcentrically. with the flange 150 yon the hub'148.y A retaining washer154 r. is mounted on theahub k148lto- :secure `the :piston 152.V Ion'the hub 148.*` The huil) 148 'isnslidably mounted for longitudinalmove-'i ment on a plunger 15,6zwhich engagesacontrol valve 158' througha bearing 160 which vforms a Vliquid tightV closure for the controlvalve housing 162- i`at its end adjacentthecoupller 427;; A split ring164is secured to the Y plunger 156 and serves as axstop to engage thepistoni,` assembly 146.V When the split ring 164 engages thepiston.

assembly 146, the ,plunge-r 156 :moves togetherk longif tudinally withthe piston assembly.- 146-toward .the control valve 158'. yIt canfthusbe seen Vthat the plunger 156 i.

can move inwardly independently of the :piston assembly 146,since thereis lost motion between theplunger 156- and the piston 146.V Engageable,with the outer end of Ithe `plunger 156 is the Bowden cable 44v whichis attached at its other end to the control=assembly body 70,V as ex-yplained hereinabove. Thus, longitudinal :movement ofthel Bowden cablev44-eiJt`ects longitudinal movement of the plunger-156? to operate the`control valve 158i of the .wiper v-motor 14.Y The plunger y156 may alsobevope-rated .by

the `coupler 42 through movementof-the piston assemblyl 146.v Whenlvacuum is applied to the; ,cylinder 144V through conduit 46, the`piston assembly 146-'is drawn to the rightvagainstthe 'bias .of` aspring.166,.as seen 1in: FIG. 3, thereby engaging the .split ring 164 todrivethe.

plunger r-od156 toward v`thegright as seen in FIG. 3, which plunger Irod156.V in turnengages thecontrolzvalve .158 to move 1t to variousoperative positions.

The spring 166: 1s.. disposed intermediate anfend 'of the cylinderandthe v piston assembly 1463,'and biases the piston assembly 146noutwardly. This results in movement of the control valve and plunger rod156 outwardly thereby moving control valve 158 to a position where land159 closes passage 161, placing the motor 14 in the off position. Inaccordance with the normal operation of motor 14, the control valve 158will be biased to the off position by fluid pressure when the pistonassembly 146 and the plunger rod 156 are in their outermost position.The hydraulic motor 14 is similar to that shown in co-pendinglapplication Serial No. 351,414, filed March l2, 1964, by Anthony R.DAlba and Raymond A. Deibel, and assigned to the assignee of the presentinvention. It will, of course, be understood that any suitable motor maybe employed utilizing Ia combination mechanical and uid pressureactuated coupling arrangement.

The timer control 48 comprises a body 168 divided into a rst chamber 170and a second chamlber 172 separated by a spring biased check valve 174which is biased to its closed position to preclude communication betweenchambers 170 and 172 by a spring 176. The conduit 40 communicatesthrough the chamber 170 with conduit 46 to permit uninterruptedcommunication between housing 144 of coupler 42 and port 96 of manualcontrol assembly 38. The coupler 42 may be vented through the timercontrol 48 by way of conduit 40, chamber 170, and a filtered adjustableatmospheric bleed 178. In this manner, the timing of the dry wipe cycleduring joint wiperwasher operation is regulated. The atmospheric bleed178 is adjustable .by a tapered threaded plug 180 receivable in opening182 through a porous filter 184. Compression of filter 184 increases thebleed time, thereby increasing the duration of the dry wipe cycle. Ports173 and 175 permit uninterrupted communication between conduits 40 and46 through chamber 170. When vacuum enters chamber 172 through port 175and conduit 49, differential pressure between chambers 170 and 172enables valve 174 to overcome the bias of spring 176 thereby unseatingit to admit vacuum into chamber 170 and out through port 175 to conduit46 as well as through port 177 to conduit 50. When communication betweenchamber 172 and the vacuum source is interrupted by seating of valve 81in the manual control assembly 38, chamber 172 vents to the atmospherethrough vent opening 181 in chamber 172.

The washer pump 24 is a type which is actuated to operative position byapplication of a vacuum pulse. It is actuated to discharge Aby a cam onthe motor shaft, as shown, or iby any other suitable or desirable movingelement of the wiper transmission or linkage assembly. The pumpcomprises a housing 190 forming a cylindrical chamber 192 which isdivided into a first compartment 194 and a second compartment 196 byreciprocating piston 198. The intake port 30 and the discharge port 32is in communication with the chamber 194 through suitable check valving(not shown). Secured to the piston 198 is a plunger rod 200 whichextends outwardly of the housing 190. A vacuum port 202 is providedwhich extends through the housing .and communicates with the chamber196. Thus it can be seen that when a vacuum pump is applied through port202 to chamber 196, the piston 198 moves in a direction to effect anintake stroke and projects plunger rod 200 outwardly. So long as thechamber 196 has either vacuum applied to port 202 or is sealed from theatmosphere, a pressure differential will be created across piston 198,tending to bias the piston to the intake position and the plunger -rod200 to its outermost position. The pump is mounted in such a position asto cause plunger rod 200, when extended, to engage a cam 204 which maybe mounted on the motor output shaft as shown or on any other suitableor desirable movable element of the wiper transmission system. It shouldbe understood that although the cam 204 is shown on the motor outputshaft and the pump 24 is shown mounted on the motor housing, the pumpmay be mounted in any suitable or convenient location adjacent a movingelement of the windshield wiper transmission system and the cam may besuitably mounted for engagement with the plunger 200. An example of suchan alternate mounting of the pump may be at Vthe pivot shaft 18. The cam204 may be mounted on the pivot shaft 18 and the pump may be mounted onthe pivot shaft bracket. The pump 24 is described in greater detail inco-pending application Serial No. 304,431, now .Patent No. 3,209,384,'by Anthony R. DAlba, filed August 26, 1963, and assigned to theassignee of the instant invention.

A complete description of the contsruction and operation of the motor 14herein disclosed is not necessary for a full understanding of theinvention and, therefore, only the essential portions of the controlvalve will be described. The control housing 162 includes the port 161which communicates through various conduits and valving with the exhaustfrom the motor piston chamber. When the control valve 158 is in itsextreme outer position wherein the land 159 closes the port 161, themotor remains in its parked or off position. When the grooved portion159' of the land 159 of control valve 158 overlies the port 161,intermittent wiper operation is obtained, resulting in a dwell periodbetween wiper cycling. The duration of the dwell period may beadjustable and is regulated `by the number of grooves which overlie theexhaust port. These grooves permit slow bleeding of fluid through theport 161 and the great-er the number of grooves which overlie the port,the faster the bleeding and the shorter the duration -of the dwellperiod. Thus, if the control valve 158 is moved from its parked positionto its continuous run position, that is, from its extreme left positionto its fully on position, as seen in FIG. 3, the dwell period becomesshorter and shorter until it reaches the continuous run position whereinthe port 161 is fully opened. In order to control the positioning of thecontrol valve 158 as -above described through actuation of plunger 156,a detent assembly 163 is provided on the control assembly body 70 of themanual control assembly 38. This detent assembly 163 includes a pair ofradially extending detent yarms 165 which engage in notches 167 formedon the inner periphery of a recess 169 of the closure 116 and thecontrol yassembly 38.

The elements of the windshield cleaning system of this invention andtheir functions have been described in detail. A description of theoperation of the overal-l system follows: When it is desired to initiatecontinuous wiper motor operation, the knob 98 is rotated clockwise andthe manual control assembly body 70 is thus moved longitudinally causingthe Bowden wire 44 to move the plunger rod 156 of the motor coupler 42inwardly, thereby driving the control valve 158 inwardly to thecontinuou-s run position. This is purely a mechanical operation andinvolves none of the vacuum actuated components.

To initiate intermittent windshield wiper operation, the knob 98 of themanual control assembly 38 may be rotated to the first detent position.This causes movement of the control valve 158 through Bowden wire 44 toa position wherein the grooved portion 159 of the control valve 158partially covers the exhaust opening 161 in the motor control housing.When control valve 158 i-s in this position, delayed action occurs atone end of the wiper stroke, permitting intermittent dwell operation.Further movement to subsequent detent position places more grooves inthe path of the exhaust port of the wiper motor thereby reducing thedelay at the end of the wiper stroke, thus resulting in -a shorter dwellper-lod. Rotation of the knob -counterclockwise to its extreme positionturns the wiper motor off. When the control knob is rotated to thedetent position for intermittent dwell operation, the resilient valve 88moves to the right from the position illustrated in FIG. 3 to a positionwhere the port is opened to permit communication through conduit 62 toport 142 of the continuity valve. there is suicient man-ifold vacuumentering the continuity valve through conduit 56 Iand port 140, thepiston 130' together with its piston rod 131 is drawn to the right tothe position illustrated in FIG. 3. The valve end of the rod 131 sealsthe port leading to the vacuum storage tank through conduit 52 andprevents vacuum pressure from exhausting through conduit 62 and port 90.Dur ing acceleration of the vehicle, the manifold vacuum pressure dropsventing chamber 128 of the continuity valve 54 on the right side ofpiston 130 permitting spring 133 to bias piston 130 to the left, therebyopening the port 138 to conduit 52. The storage tank vacuum thenAtinuous operation is a desirable and advantageousfeature because when avehicle accelerates to pass Vanother vehi. cle, splash-back of wetness`from the road impinges on the windshield `and requires continuous wipermotor operation rather than intermittent'dwell operation even duringperiods of light to moderate precipitation. Subsequent to theacceleration period, continuous` operation is prolonged for a measuredperiod of time. When, the vehicle returns to normal steady speedoperating condition, the chamber 128 is again exposed to high manifoldvacuum pressure and the piston 1300i continuity valvek 54 is drawn downwhich in turn reseats the valve 131i` cutting olf storage tank Vacuumpressure. The coupler chamber 147 then bleeds down through conduit 40and through vent 180 of timer 48. The conduit 40 is deadended at thecontinuity valve when the plunger 131 seals of the vacuum storage tank58; Thus, thel return lto intermittent dwell is-controlled by the timervalve 48.

In order to initiate a conjoint washer-wiper operation,

the button 102 -is depressed. Depressing the button 102 opens the valve8i). The central tubularportion of manual control assembly body 70 isexposed to storage.

tank vacuum pressure through conduit 60. When the valve 8i) opens,vacuum is applied to the chamber 89,.y

through the clearance between stem 82 and the reduced inner diametersection 76 of valve body 70. It lcommunicates through port 106tofchamber 89 and thro-ugh the clearance between the spiral disc 72 andthe housing 64 to port 112 and through conduit 49 to the chamber 172ofthe timer valve 48; The vacuum applied-:to chamber 172 unseats checkvalve 174 and thevacuum pressure divides passing through conduit`46 tochamber 147 of coupler 42 and through conduit Sil/to port'202 of thewasher pump 24. The kvacuumvso applied draws down lpiston 146 of coupler42; plunger 156 is driven to the right to the position -shown in FIG.`3,.,causing control valve 158 of motor 14 to operate to initiatefcontinuous wiper motor action. At the same time,ivacuum is applied toport 202 to chamber 196 of w-asher pump 24 drawing down piston.198 toeiiect an intakerstroke, drawing washer uid through Vintakeport 30andprojecting plunger 200 into engagement with cam 204.1 The operationofthe motor rotates cam'204, causing .it tot drive plunger 200 inwardlyto effect a discharge stroke. Solong Vas the button remains depressed,the vacuum pressure remains at port 202 and returns the plunger: 200

to its outermost position -biasing it Vagainst caml 204. When the button102 of manual control assembly38 is l released, the chamber 196 ofpumpr124 vents tov theV During ordinary operation of the vehicle whenyuntil chamber 147 bleeds down through the regulated bleed 178throughconduit 46 :and chamber 170. De-l pending upon the `adjustrnentsof plug180, the wiper motor will continue tocycle for a fixed period of timesubsequent to the discontinuance of pump operation.

This provides a timed period of dry-wipe cycling.

Under certain:conditions,.it is desirable to abort wiper cyclingquickly; for example, -uponspraying of washerv solvent onto thewindshield, vshould-it be, discovered that the liquid is freezing,.itwouldbe undesirable to have the wiper. blade spread the lliquidacrossthe entire windshield. The voperator may pull knob .98 to which is l`coupled valve 94 for movement longitudinally therewith.

This permits immediate and instantaneous ventingof chamber 147 'throughconduit 46,=` chamber 170'in timer valve 48 continuing through conduit40 through port-96 through port 97= and .clearance 99 surrounding valvestem 923 Spring 166 ofrmotor coupler 42 'biases piston assembly 146 tothe .left 'from the positionshown in FIG. 3,I

releasing plunger 156,v causing theY lcontrol valve 158 to return to theWiper-oil? positionf,

Thusitcan be seen that through the use of a single unitized manualcontrol assembly of `unique design, a Wind.-

sh-ield cleaning system is provided and isparticularly ap- Y plied, asdescribed herein, .to -a hydraulic wiper motorv which provides variablespeed, continuous run wiper operation, intermittentdwell loperation Withvariable dwell period durations, conjoint washer-wiper operations,switchover to vcontinuous loperation trom .intermittent dwell openationduring'periods of vehicle acceleration and an `albortf` able dry wipecycle.

It should noW- be apparentithat `a windshield cleaning system has beenprovided which accomplishes the above describedobjectiives'.- Acertainispecitic em-bodimentfof the inrvention has been vdescribed forthel purpose Vof illus-L Y tration, vbut it;will be apparent thatvarious modiiications f motor having a vacuurnactuatable couplerforinitiating a h 'timed period of wiper motoroperat-ion andawasher-pump responsive to a vacuum pulse for initiating' operatiomaunitized manu-ally operated. control including meansforsimultaneouslysupplying a vacuum pulse `to said coupler and said pump withfa singlemanual operationtoetfeot conjoint Wiper-washer operation and manualmeans to sulb.- stantially instantaneously albort said timed periodl oflwiper motor operation.

2. In a windshield vcleaning systemcomprising a wiper motor ,and awasher pump; a lunitized manually operated control comprising means `forsimultaneously energizing said wiper motor to initiate a timed period ofwiper motorI operation vand to actuate said pump .with a single manual.operation `and manual means to substantially instantanea ously abortsaid timed period of wiper motor operation.

3. 'In a windshield cleaning system comprising awiper motor ,and awasher pump responsive to a vacuum pulse for initiatingE pump operation;a .unitized manually operrz` atedcontrol including means `forsimultaneously energiz'V ing said wiper motor `to initiate a timedperiod of .wiper` motoroperation and forisupplying a vacuum pulse tosaid washer epump toinitiate .conjoint pump operation and fa timedwipermotor period of operation with a singlemanu-t al operationl andmanual meansi to substantially Ainstan taneously abort said ltimedperiod of 1 wiper; motor-r operation.

4. Win-dshieldcleaning apparatus comprisinga wind-zY shieldwiper,`awiperr mortorjfor driving, said wiper, ga windr'A shield washerincluding a washer pump,v control apparatus ttor operating said wiper`continuously or intermittently with adjustable dwell periods betweencycles of wiper operation, pressure responsive valve means for switchingsaid wiper from intermittent operation to continuous operation durngperiods of vehicle acceleration and manually operated control means dorsimultaneously initiating conjoint washer operation and Wiper operati-onfor a timed period and for substantially instantaneously aborting saidtimed period of wiper motor operation.

5. Windshield cleaning apparatus comprising a windshield wiper, a wipermotor for driving said Wiper, a windshield washer including a Washerpump, contr-ol apparatus for operating said wiper continuously orintermittently with adjustable 'dwell periods between cycles olf Wiper'ofperation, pressure responsive valve means for switching said Wiperfrom intermittent operation to continuous operation No references cited.

CHARLES A. WILLMUTH, Primary Examiner'.

1. IN A WINDSHIELD CLEANING SYSTEM COMPRISING A WIPER MOTOR HAVING AVACUUM ACTUATABLE COUPLER FOR INITIATING A TIMED PERIOD OF WIPER MOTOROPERATION AND A WASHER PUMP RESPONSIVE TO A VACUUM PULSE FOR INITIATINGOPERATION; A UNITIZED MANUALLY OPERATED CONTROL INCLUDING MEANS FORSIMULTANEOUSLY SUPPLYING A VACUUM PULSE TO SAID COUPLER AND SAID PUMPWITH A SINGLE MANUAL OPERATION TO EFFECT CONJOINT WIPER-WASHER OPERATIONAND MANUAL MEANS TO SUBSTANTIALLY INSTANTANEOUSLY ABORT SAID TIMEDPERIOD OF WIPER MOTOR OPERATION.